function validate(formNode){
  var formValidatorInstance = new FormValidator(formNode);
  formValidatorInstance.addRule('name','We need a name to reply properly','required');
  formValidatorInstance.addRule('email','We need a valid email address with which to reply','email');
  formValidatorInstance.addRule('caption','There appears to be nothing in the caption box','required');
  formValidatorInstance.addRule('include-name','You have not told us whether to include your name','ischecked');
  formValidatorInstance.addRule('include-email','You have not told us whether to include your email','ischecked');
  return formValidatorInstance.validate(); 
}